Cap for an ink cartridge



FIG. 1 is a front, top and right side perspective view of a cap for an ink cartridge showing our new design;

FIG. 2 is a rear, bottom and left side perspective view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a bottom plan view thereof;

FIG. 7 is a right side view thereof; and,

FIG. 8 is a left side view thereof.

The broken lines illustrate portions of the cap for an ink cartridge and form no part of the claimed design. 

CLAIM The ornamental design for a cap for an ink cartridge, as shown and described. 